The HEM554D from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 2700 to 3000 MHz, Gain 23 to 24 dB, Gain Flatness ±0.5 dB, Noise Figure 1.1 dB, Output Power 8 to 9 dBm. Tags: Low Noise Amplifier. More details for HEM554D can be seen below.